The Html import is similar to the RTF one. You may experience some format losses (some editors use tags in a way that’s not perfectly compatible with both NS and IE, so CDFrontEnd tries to import at least the content). There is an option to skip tables when importing (see the “Options” tab). Click on the image to get Help:

Just drag the file to be imported from the left to the right. After the import you might have to use CTRL+ CTRL- to browse pages.